What to use on old garage doors?

[notquiteclueless]

Hi - The problem area is a set of very old wooden (pine) garage doors. Facing due south. Before I started tackling them about five years ago, they'd probably not been touched in about 20 years. The remnants of some kind of dark stain were still there. I sanded back, and then used clear Sadolin. It looks great when done, just natural and glowing, but only seems to last a couple of years before flaking off completely -- I've done it three times now, and I feel the wood is really not protected very well.

What would be a good approach that will protect the wood better?

 

[sircerebus666]

Yacht varnish will last longer but any varnish will flake off in time especially as it's south facing

You might be better off with a stain , won't last any longer but is much easier to reapply as it will just need a sand down unlike varnish which needs completely removing before you reapply